HP Visualize J5000 hp workstations - hp-ux 10.20 graphics administration guide - Page 106

hp PEX Graphics Performance, Optimized vs. Normal 3D Performance, Rendering Conditions

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hp PEX Graphics Performance Optimized vs. Normal 3D Performance Rendering Conditions Performance Optimized For: Factors Affecting Performance: • Light sources: • A total of more than 8 directional and o Best: up to 8 directional light positional light sources cause a noticeable sources, plus ambient performance degradation o Good: a mixture of up to 8 • Picking directional and positional light sources, plus ambient • Directional eyepoint (this is the default in • Any of the following ways of heavily interleaving changes: o Frequent attribute changes (e.g., hp PEX unless compliance mode is frequent changes of line color) enabled) relative to the number of primitives • Back-face culling off, or back-face culling being drawn on with supplied geometric normals o Frequent changes of the type of (culling usually results in a performance primitive (e.g., switching between improvement) Fill Areas and Polylines at a high • View clipping on frequency) • Isotropic modeling matrix (anglepreserving) • Color approximation type PEXColorSpace • OCC primitives • Packed or stride data format o Frequent changes of vertex attributes (i.e., the data being supplied with each vertex) o Frequent changes of modal state, such as: ƒ Double-buffering (especially MBX or DBE) ƒ HLHSR mode or ID ƒ Light sources enabled ƒ Depth cueing state ƒ Texture mapping state o Frequent switching between two or more active Renderers o Frequent mixing of Xlib and hp PEXlib calls • Redundant or unnecessary setup (e.g. setting attributes that are not relevant to the primitives being drawn) • Deformation on • Model clipping on • HLHSR in software via PowerShade (on unaccelerated graphics devices) Page 106 Graphics Administration Guide for HP-UX 10.20

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hp PEX Graphics Performance
Optimized vs. Normal 3D Performance
Rendering Conditions
Performance Optimized For:
Factors Affecting Performance:
•
Light sources:
o
Best: up to 8 directional light
sources, plus ambient
o
Good: a mixture of up to 8
directional and positional light
sources, plus ambient
•
Directional eyepoint (this is the default in
hp PEX unless compliance mode is
enabled)
•
Back-face culling off, or back-face culling
on with supplied geometric normals
(culling usually results in a performance
improvement)
•
View clipping on
•
Isotropic modeling matrix (angle-
preserving)
•
Color approximation type PEXColorSpace
•
OCC primitives
•
Packed or stride data format
•
A total of more than 8 directional and
positional light sources cause a noticeable
performance degradation
•
Picking
•
Any of the following ways of heavily
interleaving changes:
o
Frequent attribute changes (e.g.,
frequent changes of line color)
relative to the number of primitives
being drawn
o
Frequent changes of the type of
primitive (e.g., switching between
Fill Areas and Polylines at a high
frequency)
o
Frequent changes of vertex
attributes (i.e., the data being
supplied with each vertex)
o
Frequent changes of modal state,
such as:
Double-buffering
(especially MBX or DBE)
HLHSR mode or ID
Light sources enabled
Depth cueing state
Texture mapping state
o
Frequent switching between two or
more active Renderers
o
Frequent mixing of Xlib and hp
PEXlib calls
•
Redundant or unnecessary setup (e.g.
setting attributes that are not relevant to the
primitives being drawn)
•
Deformation on
•
Model clipping on
•
HLHSR in software via PowerShade (on
unaccelerated graphics devices)
Graphics Administration Guide for HP-UX 10.20
Page 106